我正在尝试在django应用上运行一些测试，但是我在迁移过程中始终遇到错误。
我正在使用docker-compose运行我的应用。我可以运行服务器，在dev db中添加数据，没有任何问题，但是当我尝试运行测试时，出现此错误：
python3 manage.py test -v 3
Creating test database for alias 'default' ('test_myapp')...
Operations to perform:
Synchronize unmigrated apps: gis, messages, rest_framework, staticfiles
Apply all migrations: admin, app, auth, authtoken, contenttypes, sessions, token_blacklist
Running pre-migrate handlers for application admin
Running pre-migrate handlers for application auth
Running pre-migrate handlers for application contenttypes
Running pre-migrate handlers for application sessions
Running pre-migrate handlers for application authtoken
Running pre-migrate handlers for application token_blacklist
Running pre-migrate handlers for application app
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Running migrations:
No migrations to apply.
Your models have changes that are not yet reflected in a migration, and so won't be applied.
Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.
Running post-migrate handlers for application admin
Running post-migrate handlers for application auth
Running post-migrate handlers for application contenttypes
Running post-migrate handlers for application sessions
Running post-migrate handlers for application authtoken
Running post-migrate handlers for application token_blacklist
Running post-migrate handlers for application app
System check identified no issues (0 silenced).
测试正在运行，但是它们正在使用dev db（我可以在测试中访问我的dev数据），并且如果没有这个错误，我一次不能运行多个测试文件：
test_str (app.tests.tests_models.test_entity.TestEntity) ... Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 235, in _cursor
return self._prepare_cursor(self.create_cursor(name))
File "/usr/local/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 223, in create_cursor
cursor = self.connection.cursor()
psycopg2.InterfaceError: connection already closed
我已经尝试删除我的数据库，所有 pycache 文件夹以及所有迁移，重新运行makemigrations和迁移，但是错误仍然显示...